Manufacture of products from india-rubber.



H. DOGNY, V. HENRI & E. VEIL-PIOARD. MANUFACTURE OF PRODUCTS FROM INDIA RUBBER. APPLICATION FILED JAN. 22, 1910.

Patented Feb. 24, 1914.

. UNITED STATES PATENT OFFICE.

HENRI DOGNY, VICTOR HENRI, AND EDMOND VEIL-PICABD, 0F PARIS, FRANCE.

MANUFACTURE OF PRODUCTS FROM INDIA-RUBBER.

Specification of Letters Patent. Patented Feb-24, 1914,

Application filed January 22, 1910. Serial No. 539,583.

To all whom it may concern:

Be it known that we, HENRI DOGNY, residing at 13 Avenue dEylau, Paris, VICTOR HENRI, residing at 82 Rue Claude Bernard, Paris, and EDMOND VEIL-PmAnmjresiding at 76 Avenue Wagram, Paris, in the Republic of France, citizens of the Republic of France,

engineers, have invented certain new and useful Improvements in and Relating to the Manufacture of Products from India-Rubber, of which the following is a specification.

This invention has reference to improvements' in the manufacture of products from india-rubber or other suitable resilient material, of the kind which are composed of either perforated sheets or perforated and unperforated sheets of such material, which are united together and have the cavities so formed filled with gas or air whereby a pneumatic and resilient structure is obtained.

The object. of our invention is to provide multi-cellular structures of this nature, which shall possess importanttechnical advantages over those hitherto constructed, and which shall be of simple construction and eflicient in operation.

To this end, our invention broadly consists in uniting perforated sheets of indiarubbe'r or other appropriate resilient material, with the interposition of-unperforated sheets if desired,'and in incorporating with the mass of material, substances which when heated will decompose into gas or vapor. The result obtained by this process is extremely important, the substances which liberate the gas are incorporated with the substance of the resilient sheets, and dissociation takes place under the influence of heat, but as the india-rubber is partly permeable when itvis heated, a portion of the ases passes from the mass of india-rubber .g nto the empty cells, while the other portion remains inclosed in the mass subsequent to this and upon cooling, the material becomes impermeable and the dissociated gases remain, consequently the pressure obtained is persistent.-

By this 'rocess vantages as, compared with the known elastic article. In the first place it may be ,constituted by .pure rubber of the best quality and its cavities are filled with gas which is conit will be seen that a prod-- not is obtalned which presents numerous adstantly-imprisoned therein; In addition, the size of the cavities and their distribution may conform exactly to the ideas of the manufacturer, in the sense that he can arrange the perforations at appropriate places on the sheets and give them any desired dimensions and forms which he may consider useful for the purpose in view; by this means it is readily possible to produce in the same object parts which are more or less pliable and more or less elastic according tore uirements. I I

11 carrying out the process, the perforated and unperforated sheetsmay be superposed flat or on a mandrel or an appropriate form. A sufficient number 0 them ma be provided t6 cause the total thickness 0 the lock to correspond to the thickness of'the article to be manuic'actured.- A sheet may also be taken in the form of a band either a single band or one composed of any desired number of superposed sheets, and this band may be wound or bent u on itself in order to obtain the desired thic ness.

The employment of unperforated sheets between the perforated sheets may be avoided in certain cases; for example, when the perforated sheets can be superposed directly without their holes registering. It is also possible to'superpose perforated sheets with their holes registering wholly or in part, in such amanner as to create cavities oi. all

shapes. i

In order to unite the sheets one with the other, they may be coated when they are being superposed, with a suitable solvent such as benzin or the like, or with any other appropriate agglutinant or adhesive substance. The articles are then heated to temperatures which vary according to the nature of the materials employed, and the dimensions of the articles to be manufactured. During this heating, which may be effected in the open air or under pressure, the gases or Yapors inclosed in the cavities, will tend to expand and may produce a certain permanentdeformation of thewalls of these'cavities as shown in Figure 1 of accompanying draw- ,ing which represents a partial cross section I I silient material in any convenient manner during the course of manufactures For example, solid substances such as carbonates, hydrochlorates, carbids, and the like or liquids such as ether ammonia water, benzin, or

-the like, which are capable of liberating gases or vapors after a lapse of time under the influence of heat or by simpledecomposition, by mutual reaction with other sub stances by vaporization and so forth, may be introduced. By varying the uantity of the substances thus introduced t e pressure in the cavities Will be varied. This incorporation of the substances may be effected either throughout the entire mass'or in a.

of some suitable kind and o appropriate form which will permit of compressing 1t, by a pressure proportionate tothe elastic resistances that it s desired to obtain. For example,-for wheel tires the elastic resistances of an air chamber thus manufactured .may be varied by confining it in an envelop or cover which may be tightened on tothe rim of the wheel to a greater or less-extent.

Amon the numerous applications to which tie present invention lends itself,

bufiers and. shock absorbers elastic cushions,

cushions for vbilliard tables, the air chambers or tires of wheels, may be cited.

- Claims- 1 1. A process for the manufacture of articles from india rubber which consists in forming perforated sheets of rubber having incorporated therein one or more substances capable of liberating gases under the efl'ect of heating, in uniting the perforatedasheets in such a manner that the perforations form independent cavities, and lastly in applying heat to the structure thus formed, for the purpose of liberating gases Which may fill the said cavities.

2. A process for the manufacture of arti-' cles of india-rubber which consists in. forming perforated and unperforated sheets of rubber having incorporated therein one or more substances capable of liberating gases under the iefiectlof heating, in uniting the perforated and unperforated sheets in such a manner that the perforations form independent cavities, and in applying heat to the structure thus formed,v for the purpose of liberating gases which may fill the said cavities as our invention, we have signed our names in presence of two subscrlbing witnesses.

HENRI DOGNY.

VICTOR HENRI.

EDMOND VEIL- PIQARD.

Witnesses:

GAMILLE BLIETRY, MAURICE RAU.

In testimony', that we claim the foregoing 

